Crossword Genius

True spasms when corrected gain acceptance (4,6)

Ross

I believe the answer is:

pass muster

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'gain acceptance' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'true spasms when corrected' is the wordplay.
'when corrected' indicates an anagram.
'true'+'spasms'='truespasms'
'truespasms' with letters rearranged gives 'PASS MUSTER'.

Can you help me to learn more?

(Other definitions for pass muster that I've seen before include "Satisfy, suffice" , "To fit the bill" , "Be good enough" , "appear acceptable" .)

I've seen this clue in the Sydney Morning Herald.
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